J/A+A/546/A79 400d Cluster Survey Weak Lensing Programme II (Israel+ 2012)
The 400d Galaxy Cluster Survey weak lensing programme:
II: Weak lensing study of seven clusters with MMT/Megacam.
Israel H., Erben T., Reiprich T.H., Vikhlinin A., Sarazin C.L., Schneider P.
<Astron. Astrophys. 546, A79 (2012)>
=2012A&A...546A..79I 2012A&A...546A..79I
ADC_Keywords: Clusters, galaxy ; Galaxies, optical ; X-ray sources
Keywords: galaxies: clusters: general - cosmology: observations -
gravitational lensing - X-rays: galaxies: clusters
Abstract:
Evolution in the mass function of galaxy clusters sensitively traces
both the expansion history of the Universe and cosmological structure
formation. Robust cluster mass determinations are a key ingredient for
a reliable measurement of this evolution, especially at high redshift.
Weak gravitational lensing is a promising tool for, on average,
unbiased mass estimates.
This weak lensing project aims at measuring reliable weak lensing
masses for a complete X-ray selected sample of 36 high redshift
(0.35<z<0.9) clusters. The goal of this paper is to demonstrate the
robustness of the methodology against commonly encountered problems,
including pure instrumental effects, the presence of bright (8-9mag)
stars close to the cluster centre, ground based measurements of high-z
(z∼0.8) clusters, and the presence of massive unrelated structures
along the line-sight.
Description:
Here, we present the final stacked ``coadded'' analysed in the paper.
The data set consists of observations of eight fields centred on
galaxy clusters selected from the 400d survey (Burenin et al., 2007,
Cat. J/ApJS/172/561, Vikhlinin et al. 2009ApJ...692.1033V 2009ApJ...692.1033V). All of
these clusters have been observed with the Megacam wide-field imager,
then located at the 6.5m MMT telescope at Fred Lawrence Whipple
Observatory (files MMT*). The galaxy shapes analysed in our article
were drawn from the r' band images (*_r.fits), consistently. For four
of the clusters, auxiliary bands (g', i') could be observed and taken
into account for galaxy selection. Note that the r' band of CL
0030+2618 and the g' and r' bands were taken in non-photometric
conditions, while the rest of the data is of photometric quality. We
also include observations obtained with the CFHT MegaCam/MegaPrime
imager (files CFHT*) for CL 1701+6414 in the g'r'i'z' filters, which
we analysed for comparison. Note that the exposure time of these
images in accessible in the fits headers via the TEXPTIME keyword, not
via EXPTIME. For all images, we also include the weight and flag
images used in our analysis, giving the pixel-to-pixel quality
variation in the main files and regions excluded from the analysis,
respectively.
Objects:
----------------------------------------------------------
RA (2000) DE Designation(s)
----------------------------------------------------------
00 30 33.6 +26 18 16 CL 0030+2618 = ClG J0030+2618
01 59 18.2 +00 30 12 CL 0159+0030 = ClG J0159+0030
17 01 30.22 +64 12 05.4 CL 1701+6414 = ClG J1701+6414
02 30 26.6 +18 36 22 CL 0230+1836 = ClG J0230+1836
08 09 41.0 +28 11 58 CL 0809+2811 = ClG J0809+2811
13 57 19.4 +62 32 42 CL 1357+6232 = ClG J1357+6232
14 16 28.1 +44 46 38 CL 1416+4446 = ClG J1416+4446
16 41 52.5 +40 01 29 CL 1641+4001 = ClG J1641+4001
17 01 30.22 +64 12 05.4 CL 1701+6414 = ClG J1701+6414
----------------------------------------------------------
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
list.dat 72 60 List of FITS images
fits/* . 60 FITS images
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See also:
J/ApJS/172/561 : The 400d cluster Survey (Burenin+, 2007)
Byte-by-byte Description of file: list.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 9 F9.5 deg RAdeg Right Ascension of center (J2000)
10- 18 F9.5 deg DEdeg Declination of center (J2000)
20- 24 F5.3 arcsec/pix Scale Scale of the image
28- 32 I5 pix Nx Number of pixels along X-axis
33 A1 --- --- [x]
34- 38 I5 pix Ny Number of pixels along Y-axis
43- 72 A30 --- FileName Name of FITS file in subdirectory fits
74-103 A30 --- FlagFile Name of FITS flags file in subdirectory fits
105-134 A30 --- wFile Name of weights file in subdirectory fits
--------------------------------------------------------------------------------
Acknowledgements:
Hodger Israel, hisrael(at)astro.uni-bonn.de
References:
Israel et al., Paper I 2010A&A...520A..58I 2010A&A...520A..58I
(End) Patricia Vannier [CDS] 09-Oct-2012